A5042000233- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Advanced Optical Sensing Technologies
- Remote Sensing in Agriculture
- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Calibration and Measurement Techniques
- Earthquake Detection and Analysis
- Ocular and Laser Science Research
- Planetary Science and Exploration
- Spectroscopy and Laser Applications
- Geophysics and Gravity Measurements
- Meteorological Phenomena and Simulations
- Astro and Planetary Science
- Spacecraft Design and Technology
- Historical Astronomy and Related Studies
- Air Quality Monitoring and Forecasting
- Spectroscopy Techniques in Biomedical and Chemical Research
- Infrared Target Detection Methodologies
- Astrophysics and Cosmic Phenomena
- Remote Sensing and LiDAR Applications
- Space Satellite Systems and Control
- Aeolian processes and effects
Universidad Carlos III de Madrid
2016
Universitat Politècnica de Catalunya
2006-2016
Aryabhatta Research Institute of Observational Sciences
2013-2014
Korea Astronomy and Space Science Institute
2009-2010
Abstract. The annual and seasonal variability of aerosol optical properties observed by means a Raman lidar over Northeastern Spain has been assessed. representativeness first checked against sun-photometer measurements in terms thickness. Then the cycle planetary boundary layer thickness its fraction compared to columnar thickness, ratio, backscatter-related Ångström exponent height are analyzed discussed. Winter summer mean profiles extinction, backscatter ratio retrieved with algorithm...
Abstract. This paper introduces the recent European Aerosol Research Lidar Network (EARLINET) quality-assurance efforts at instrument level. Within two dedicated campaigns and five single-site intercomparison activities, 21 EARLINET systems from 18 stations were intercompared between 2009 2013. A comprehensive strategy for campaign setup data evaluation has been established. Eleven nine participated in Intercomparison (EARLI09). In this campaign, three reference qualified which served as...
A 6-channel dichroic-based polychromator is presented as the spectrally selective unit for U.P.C. elastic/Raman lidar. Light emission made at 355-nm (ultraviolet, UV), 532-nm (visible, VIS) and 1064-nm (near infrared, NIR) wavelengths. In reception, spectral separation that separates laser backscattered composite return into 3 elastic (355, 532, wavelengths) Raman channels (386.7, 607.4 407.5-nm (water-vapor) wavelengths). The houses photo-multiplier tubes (PMT) all except NIR one, which...
This paper presents a method to compute the overlap function of lidar system in which step-index optical fiber (or bundle such fibers) is used carry light collected by telescope photoreceiver and field lens placed between increase receiver view (FOV). The use lenses classical way FOV radiometric systems (such as receiving part lidar) when there no numerical aperture (NA) limitation after lens. However, exists, case studied here, it will place limit on maximum attainable FOV. In lidars, have...
Ground‐level enhancements (GLEs) are sudden, sharp, and short‐lived increases in cosmic ray intensities registered by neutron monitors. These known to take place during powerful solar eruptions. In the present investigation, Oulu monitor have been studied for period between January 1979 July 2009. Over this span of time, increase rates 32 GLEs deduced. addition, we characteristics event‐associated flares, coronal mass ejections (CMEs), energetic particle (SEP) fluxes. We found that all were...
Total backscatter-coefficient inversion error bounds for the two-component lidar algorithm (so-called Fernald's or Klett–Fernald–Sasano's method) are derived in analytical form response to following three sources: 1) measurement noise; 2) user uncertainty calibration; and 3) aerosol extinction-to-backscatter ratio. The two different types of presented: approximate using first-order propagation exact a total-increment method. Both formulated explicit form, which is advantage practical...
AbstractIn the present study, we illustrate for first time that direct aerosol radiative forcing has large uncertainty due to diversity in simulated vertical profile of over Manora Peak, Nainital (considered be free troposheric site). In order have a comprehensive picture, choose March and October months as representative high low mass loading site, respectively. Monthly averaged optical depths (AODs) at 0.5 μm are ∼0.30 (±0.02) 0.13 (±0.01), respectively, during above months. The derived...
Abstract. This paper introduces the recent EARLINET quality-assurance efforts at instrument level. Within two dedicated campaigns and five single-site intercomparison activities 21 systems from 18 stations were intercompared between 2009 2013. A comprehensive strategy for campaign setup data evaluation has been established. Eleven nine participated in Lidar Intercomparison (EARLI09). In this campaign, three reference qualified which served as traveling standards thereafter. other have...
The problem of overlap factor (OVF) computation and its near-range sensitivity for medium-size aperture (f/10 , f/11 ) bi-axial tropospheric lidar systems using ray-tracing simulation software is presented. method revisits both detector fiber optics coupling alternatives at the telescope focal-plane along with insertion a field lens. A analysis carried out as function laser divergence, lens, detector/fiber positions, size, fiber's core diameter numerical aperture. approach presented here...
The need of a multi-spectral lidar has widely been experienced in last few years with view to invert the optical and microphysical properties aerosols their impact on climate change. As part EARLINET-GALION objectives, joint effort already made by European Aerosol Research Lidar Network (EARLINET). EARLINET advanced standard 3+2-channel configuration for instruments (3+2 standing 3 elastic channels 2 respective Raman channels) enables retrieval aerosol properties. An overview new RSLAB 3+2+1...
AbstractIn the present study, we have utilized light detection and ranging (lidar) sun photometer observations to derive vertical distribution optical depth of aerosols over Manora Peak (29.54° N, 79.45° E, 1956 m above mean sea level). The profiles revealed presence aerosol layer at 0.75 km surface contribute about 68% total (AOD) 0.50 µm wavelength during observational period. Our site being a mountainous terrain site, observe cloud formation taking place most time. In this context, it is...
The present study reports presence of periodic Wave-Like Signatures (WLS) in the D-region ionosphere detected using NWC, Australia, VLF navigational transmitter signal (19.8 kHz) observed at Allahabad, an Indian low latitude station. WLS are associated with series solar flares which includes 12 C, 3 M and 2 X class occurred during month May 2013. Significant variations on NWC-VLF amplitude phase due to different classes zenith angles. wavelet analysis control day reveals periods 40-180...
Implementation of the pure-vibrational Raman spectra lidar method for simultaneous measurements atmospheric water-vapour, aerosol extinction and backscatter coefficients is reported. A Q-switched Nd:YAG laser provides three elastic wavelengths 1064, 532 355 nm while return signal collected by a 40-cm aperture telescope. spot-to-spot fiber bundle conveys light from telescope focal plane to specific polychromator especially simulated designed with care on minimizing optical losses physical...
To extend and reinforce the action of EARLINETASOS project, a nucleus Spanish advanced lidars was created. Four systems were intercompared satisfactorily in terms backscatter coefficients at two elastic wavelengths.
A methodology aimed at validating elastic-channel optical power return and signal-to-noise ratio (SNR) levels estimated the link-budget design stage of a tropospheric lidar against measured ones is presented. Rayleigh fit along with knowledge atmospheric aerosol transmittance emission energy used to theoretically estimate net voltage responsivity. As further refinement, when simultaneous analog photon-counting acquisition available, method formulates rough losses in receiving chain....
Abstract. The annual and seasonal variability of aerosol optical properties observed by means an elastic-Raman lidar over Northeastern Spain has been assessed. representativeness first checked against sun-photometer measurements in terms thickness. Then the cycle planetary boundary layer thickness its fraction compared to columnar thickness, ratio, backscatter-related Ångström exponent height have analyzed discussed. Winter summer mean profiles extinction, backscatter ratio retrieved with...